Iechanism for operating beds of printing-machines



(No Model.) 2 Sheets-Sheet L J. T. HAWKINS.

MECHANISM FOR OPERATING BEDS OF PRINTING MAGHINES. No. 319,248. Patented June 2, 1885.

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' J. T. HAWKINS.

MECHANISM FOR OPERATING BEDS 0F PRINTING MACHINES. No. 319,248. Patented June 2, 1885.

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UNITED STATES PATENT 'Orrrcne J OHN T. HAWKINS, OF TAUNTON, MASSACHUSETTS.

MECHANISM FOR OPERATING BEDS OF PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 319,248, dated June 2, 1885.

Application filed April 28, 1884. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN T. HAWKINS, of Taunton, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Mechanism for Operating Beds of Printing-Machines, which improvements are fully set forth and illustrated in the following specification and accompanying drawings.

The object of the invention is to provide such simple and comparatively inexpensive means for actuating the reciprocating bed of a cylinder printing-press, that the same may be applied either to an oscillating-cylinder machine or to one in which the cylinder revolves continuously in one direction.

In the accompanying drawings, Figure 1 is a side elevation, principally in longitudinal vertical section through the center of the machine. Fig. 2 is an elevation of the feed-board end of the machine with the feed-board and its adjuncts omitted. Figs. 3 and 4indicate a modification of gearing hereinafter described. In said figures the several parts are respect 2 5 ively indicated byletters as follows: AA are the main frames; B, the main cross-stay; G, the impression-cylinder-an oscillating one in this case; D, the type-bed. R is a rack secured to the upper face of the bed D, and R a gear-wheel secured to the cylinder O,engaging rack R. D is a bracket secured to the under side of the bed D, at or near one end. D is a shaft journaled in the frame A, and in a bracket, D attached to the cross-stay B. 5 5 Near the inner end,and secured to shaft D is a pinion, D (Shown in dotted lines in Fig. 1 and in shaded elevation in Fig. 2.) Running freely on the extreme inner end of the shaft D" is a roller,D". (Seen only in dotted outline in Fig. 1.) An endless rack, d, is pivoted by an extension from one end of it to the bracket D at (1, and has an endless groove, d, in it, as indicated in dotted lines, Fig. 1, within which the roller D runs. rack (Z engage the pinion D. A bracket or hanger, h, is secured to the under side of the bed D. A. short shaft, h, is journaled in the hanger h, carrying upon one extremity a pulley, h and, within the opening in the hanger 5o 72 an eccentric or involute pulley, h A belt The teeth d of the v or strap, hflis secured at one end to and partly enwraps the pulley h the other end being se cured to a clamp, 7L5, projecting from the rack d. A belt or strap, h, is secured at one end to and partially enwraps the eccentrical pulley h and is secured at the other end to one end of a helical spring, h. The other end of the spring 717 is secured by a hook, h to the under side of the bed D.

It is obvious that as the rack d vibrates about the point cl", Fig. 1, it will alternately pull down upon and slack up the strap hflthus turning in one direction the pulley 71.", whose turning in said direction is resisted by the spring h attached by the belt h to the in volute pulley h. The greater the stretching of said spring the greater its resistance, of course; but said resistance is equalized by the increasing leverage of the involute pulley 7L3, whose effective diameter varies directly in proportion to the tension of the spring h The overhung weight or leverage of the rack d is thus accurately provided for and balanced in all positions.

The remaining parts of the machine are 75 all shown and fully described in the specifications of Case B, Serial No. 129,651, herewith filed, and Case A, Serial No. 124,297, filed March 15, 1884, to which reference may be had in lieu of further description here. The Sr belt tin this case is actuated from the shaft D instead of from the shaft T, as is done in said Case B.

The construction herein shown (as in said Cases A and B) is for an oscillating-cylinder press in which the cylinder runs on an cecentrical rock-shaft. It is evident, however, that if rack R and gear-wheel B were dispensed with, and the cylinder 0 made with a fixedshaft to rotate with it in the usual jouro nal-boxes in the frames A A, and proper gear-wheels were secured to the shaft D and to the cylinder-shaft outside of the frame A, as shown at y and 2, Figs. 3 and 4, either of the following-named arrangements could 9 5 be used for actuating the machine in this way while the cylinder continuously revolved: First, the cylinder may be run in the direction of the arrow, Fig. 1, and the shaft D in the same direction by the interposition of an ICO intermediate gear, as m, Fig. 4; and, second, cylinder C may run in the'direction indicated by the arrow and the shaft D in a contrary direction by the meshing of proportionate gears attached to them without the interposition of said intermediate gear, 00.

When this actuating mechanism is used in connection with a continuously-rotating cylinder, the pivotal point d" should extend to a sufficient distance below the type-head D to allow the rack dto be in a horizontal position or parallel to the line of the beds motion through the printing-stroke, and to make the inclination of said rack would produce an inequality in the beds motion, while the cylinders motion would be uniform. This machine may of course be driven by hand by the attachment of a hand-crank directly to the shaft D in place of the tight and loose pulleys P, as shown, which pulleys illustrate the application to it of power by the usual belt. v

y I do not confine myself to the exact construction herein shown anddescribed, as the same may be varied in many ways, while including strictly the principles and parts described as, for instance, the bracket D may be attached to the center of the bed crosswise of the machine, and the shaft D" extended inward to meet the rack d, pivoted to it, so that the effort to move the bed D would be applied at its center instead of at one side, as shown.

Having thus fully described my said improvements, as of my invention I claim- 1. I11 a printing-machine, in combination with a reciprocating type-bed and actuating the same, an endless rack, as (I, connected to said bed by a pivotal attachment and vibrating in a vertical plane on said attachment, and a driving-shaft running in fixed bearings, as D, carrying a pinion, as D, engaging said rack,

all located andarranged so that said rack shall vibrate in a vertical plane, substantially as and for the purposes set forth.-

2. In a printing-machine, in combination with a type-bed, an endless rack oscillating in a vertical plane about a pivotal attachment to said bed, a spring, ash, secured at one end to the said bed and at the other end to a strap 0 or belt, as h, secured to and enwrapping an eccentrical or involute pulley, as h so shaped and proportioned as to compensate the varying tension of said spring, a pulley, as 7?, secured'to a shaft, as h, journaled in a bracket, as h, secured to said bed, and a belt or strap, as h, having one end secured to and enwrapping said pulley and its other end secured to said rack, all arranged and operating substantially as and for the purpose set forth.

3. In a printing-machine, in combination with a reciprocating type-bed, an oscillating endless rack vibrating in a vertical plane about a pivotal attachment to said bed, a pinion, as D, secured to a driving-shaft, as D", running in fixed bearings and engaging said rack, and means for counterbalancing the overhung weight ofsaid rack,consisting of a spring, as h, a shaft, as h, journaled, as at h, in bearings secured to an eccentric or involute pulley, as h secured to said shaft, a strap or belt, as h, secured at one end to said spring and at the other end to and enwrapping said eccentric or involute pulley, and a strap or belt, as h, attached at one end to the said endless rack and at the other end to and enwrapping a pulley, as h", also secured upon the shaft, the whole operating substantially as and for the purposes set forth.

I JOHN T. HA xINs.

WVitnesscs:

ELISHA T. J AOKSON, J os. R. TALLMAN. 

